Supercharging?

[ducatilover]

how dp people go about supercharging a small engine? is it possible to say, mount the supercharger on top of the carbs?
if some idiot was thinking of doing this to a vt250 spada how would said idiot do it? please help me out here.... im thinking a subaru vivio sunit or maybe a small digger unit. i dont want a turbo cos i hate the thought of lag

[Lou Girardin]

The most difficult part will be the drive off the crank. A well designed turbo will be easier to do and lag shouldn't be a problem.
However, if you buy a VRod we can do a Sprintex blower for it.

[Mr. Peanut]

You could try one of these, 750cfm should provide a bit of boost for a Spada. That said, I have a strange feeling this project won't eventuate. The potential costs are huge for a relatively small gain in power.

http://www.esuperchargers.com/

[imdying]

You could try one of these, 750cfm should provide a bit of boost for a Spada. That said, I have a strange feeling this project won't eventuate. The potential costs are huge for a relatively small gain in power.

http://www.esuperchargers.com/Bahahahahahahah, I should red rep you.

[scumdog]

You need a shit-load of time AND fair bit of money UNLESS you have good machining skills and a good workshop.

But the rewards are really worth it, trust me. (despite broken parts and broken bank account.)

[Mr. Peanut]

Bahahahahahahah, I should red rep you.

Oh and you've done this have you? How do you think ram air systems work? Anyway he was asking how an IDIOT would do it :laugh:

[Toast]

Seems to be a few supercharging kits advertised in the back of UK mags from time to time, claiming 200hp+ from R1s etc.

Some did some speed testing on supercharged Gixxers and Bandits, and reckoned that they were unbelievably smooth, and massively powerful.

It's a shame they haven't taken off more on bikes, as I think they're better suited to them than a turbo. Even if less powerful, bikes don't need that much more power (how rideable is a 500hp 'Busa? Not very)

[scumdog]

Seems to be a few supercharging kits advertised in the back of UK mags from time to time, claiming 200hp+ from R1s etc.

Some did some speed testing on supercharged Gixxers and Bandits, and reckoned that they were unbelievably smooth, and massively powerful.

It's a shame they haven't taken off more on bikes, as I think they're better suited to them than a turbo. Even if less powerful, bikes don't need that much more power (how rideable is a 500hp 'Busa? Not very)

Guy down this way had a supercharged V-Max, biggest problem was keeping the front wheel on the ground.

[imdying]

Oh and you've done this have you? How do you think ram air systems work? Anyway he was asking how an IDIOT would do it :laugh:I don't need to do it, I can do simple math. Ram air? You equate a bike pushing through the air at 100mph to that little electric fan? :lol: But technically you're correct, that is what an idiot would do/use :lol:

[Ghost Lemur]

...Even if less powerful, bikes don't need that much more power (how rideable is a 500hp 'Busa? Not very)

From what I've heard, Ghostrider's 'Busa is extremely rideable. Although a set of tyres last ~80k (that's eighty kilometres!!!). Hense why he's never done a big run on them, just little clips of it.

[N4CR]

Hmm I'm looking at turbo issues, easier than supercharging as placement is not as important (no direct drive etc just exhaust and oil to turbo and air out etc). Try NOS or if you want to do SOMETHING and easy get some .7Amp 80mm computer fans (check delta models out) and chuck them on your venturi on the carbs... in the airbox if your design is similar to the zxr. It might get you a tiny bit more low down, I was going to do it. 4 of the suckers....

[onearmedbandit]

I don't need to do it, I can do simple math. Ram air? You equate a bike pushing through the air at 100mph to that little electric fan? :lol: But technically you're correct, that is what an idiot would do/use :lol:


:rofl: :rofl: :rofl:

Those fans are a joke. Peter Brock might want to sell them alongside his fuel saving magnets.

[scumdog]

I don't need to do it, I can do simple math. Ram air? You equate a bike pushing through the air at 100mph to that little electric fan? :lol: But technically you're correct, that is what an idiot would do/use :lol:

REAL ram-air works, even the temperature drop alone is worth horsepower.

Maybe not so many hp on a little bike engine at 100kph...

[imdying]

if you want to do SOMETHING and easy get some .7Amp 80mm computer fans (check delta models out) and chuck them on your venturi on the carbs... in the airbox if your design is similar to the zxr. It might get you a tiny bit more low down, I was going to do it. 4 of the suckers....You are wasting your time.

[imdying]

REAL ram-air works, even the temperature drop alone is worth horsepower.I think you misunderstood me. Indeed ram air does work, I was saying that comparing that tiny fan to ram air is laughable.

[scumdog]

I think you misunderstood me. Indeed ram air does work, I was saying that comparing that tiny fan to ram air is laughable.

Hp to drive fans: 2
Hp gained: 2.5
Hp gain: .5

AND that's if you're lucky!










Just kidding, fans don't take that much hp - and they make sweet f.a. hp too.!!!

[N4CR]

I think you misunderstood me. Indeed ram air does work, I was saying that comparing that tiny fan to ram air is laughable.

I know... but it's something to do during winter. Saw dyno charts giving 1-2 or 4nm and NO hp on a 280hp porche or something like that, slightly better low down that's it. It's something but not much. Might as well go FI.

Those fans will do 100-150cfm if you get dual motor ones (rare and limited runs etc) but it's the pressure that counts not airflow.

[N4CR]

Hp to drive fans: 2
Hp gained: 2.5
Hp gain: .5

AND that's if you're lucky!

Hmm you meaning electric? Run them switched on the battery and it won't use much more than a decent late model HID system, turn them on when you need it. Wouldn't use HP to charge battery a little bit more than usual really...

[scumdog]

Hmm you meaning electric? Run them switched on the battery and it won't use much more than a decent late model HID system, turn them on when you need it. Wouldn't use HP to charge battery a little bit more than usual really...

I defy anybody to make a MEANINGFUL hp increase using electric fans.

[imdying]

Hp to drive fans: 2
Hp gained: 2.5
Hp gain: .5

AND that's if you're lucky!Ok, so you've figured out how to get 25% more power from nowhere? Time to quit your day job, you're too smart for the police!

[imdying]

Hmm you meaning electric? Run them switched on the battery and it won't use much more than a decent late model HID system, turn them on when you need it. Wouldn't use HP to charge battery a little bit more than usual really...I feel meaning saying you're an idiot, but hey I'm not that sensitive. You're an idiot.

[scumdog]

Ok, so you've figured out how to get 25% more power from nowhere? Time to quit your day job, you're too smart for the police!

No you get a .5 hp for a total output of 2.5 by the time parasitic loss has ben subtracted - regardless of capacity.

I'd be pissed off if my 7 litre V8 only put out a .5 hp increase for a few hours work and an extra 2kg of wiring, fans, motors etc..

[imdying]

Excellent, I thought you'd lost it :lol: Love the Dyno graph on that page... made no difference... the differences in curves could be the differences from two different runs :lol:

But in all seriousness, I've got some magic beans you guys can buy... grow a money tree, honest!!!

[scumdog]

Has ANYBODY ever heard of REAL boost from electric fans???????

Except on a hot day after cutting the lawns????

[imdying]

Only those that are on P.

[stanko]

Here is a link to some info on electric superchargers
http://www.wildweasel.ca/j-body/HowTo/eturbo.asp

seems to be a waste of time, but there will always be a queue of hopefull christians.

Everyone knows the quick route to more power is trade up to a 2 stroke!

[imdying]

Here is a link to some info on electric superchargers
http://www.wildweasel.ca/j-body/HowTo/eturbo.asp

Everyone knows the quick route to more power is trade up to a 2 stroke!If I wasn't going to bling you for the link, I'm sure blinging you for the 2 stroke comment! Go the strokers :D

[ducatilover]

im sure there must be a decent electronic supercharger out there not these pathetic fans... i dont want to turbo the spada, but i do want around 60rwhp and more torque....at the least... NOS???? nope. not constant enough and also has to be refliiled

[Ixion]

I thought the bottom end on those Honda 250cc V twins was considered not to be strong? Reputation for big ends going? Need to consider that .

[scumdog]

In the 'old days' (the 70's) there use to be a 'priority valve' that let you run naturally aspirated until your turbo had enoug boost to close the valve and start directing boost into the engine.

Can't have worked too well (a bit like the fan thing - and I was being over generous when showing how much of a paucity of power it produced) or they would be still around.
K.I.S.S. - Keep It Simple Stupid in whatever hp increas method you choose.

Good luck!

[ducatilover]

I thought the bottom end on those Honda 250cc V twins was considered not to be strong? Reputation for big ends going? Need to consider that .
hmmm i think if i can source a spare engine [buckets and bits in naenae] ill experiment with that... i really want to do it though

[Shadows]

i dont want a turbo cos i hate the thought of lag

Nah dude, go turbo and get one of those things that go psssssssssssssssssssssht when you change gear! You could hang the 12 inch diameter chrome boost gauge prominently on your right mirror.

Then you could take out the shocks and cut down your springs to lower it, bungee a subwoofer on the back and swap your muffler for a 1.5kg baked bean can. Paint the can with that silver UHT paint.
You'll need some of those blue LEDs mounted on your bars too and dont forget the neon lights underneath.
Stick a little windshield over your dials so that you can tint it, and make sure you stretch black pantyhose tightly over your tail light and indicators.

You could plaster some NOS stickers on your tank, but I'm not sure where you'll be able to fit the www.ifeeltheneedtoadvertisesomebodyelsesbusiness.c o.nz (http://www.ifeeltheneedtoadvertisesomebodyelsesbusiness.c o.nz) sticker, and you might have some trouble finding new wheels which are worth at least 4 times the value of your bike.

Jokes aside though, I think you'd be wasting your time and money. I reckon you should save your cash and get a gruntier bike if what you have doesn't do it for you.

[23226]

Seems to be a few supercharging kits advertised in the back of UK mags from time to time, claiming 200hp+ from R1s etc.

Some did some speed testing on supercharged Gixxers and Bandits, and reckoned that they were unbelievably smooth, and massively powerful.

It's a shame they haven't taken off more on bikes, as I think they're better suited to them than a turbo. Even if less powerful, bikes don't need that much more power (how rideable is a 500hp 'Busa? Not very)


tts-performance.com (http://www.tts-performance.com/catalog/index.php?cPath=509&PHPSESSID=503319ea2ccaa96fd7a5327e5a0efcdb) do the odd bike supercharger and a few other things.

I want this one (http://www.tts-performance.com/rocket3supercharged.php)

[Mental Trousers]

Electric fans won't do fuck all except maybe prevent the engine from starving of air, but then that's a design issue of the bike.

But there's no reason why you can use something like a Sprintex type supercharger with an electric motor to drive it. That'd be an excellent setup as it'd be switchable and you can vary the boost at any time. Main problem is you'd need to upgrade the electrics and alternator to provide enough juice to run the thing.

[Ixion]

It would need to be a honking big electric motor. And alternator to match. It takes a shitload of power to drive a pump capable of suppling the volumes of air required.

[Mental Trousers]

Yep, it sure would. There's definitely motors available that can drive something like that, but the main problem is size and wieght. An electric motor grunty enough to drive a decent sized compressor is fairly heavy.

[Pixie]

I defy anybody to make a MEANINGFUL hp increase using electric fans.
In theory you're talking bullshit.

Supercharging - Compressor driven off crank - some of the total power gain goes to drive the compressor mechanically.

Turbocharging - compressor driven by exhaust pressure - uses waste energy,but back pressure reduces total power gain.

Electrically driven compressor - Some of the total power gain is used by the extra load on the alternator needed to drive the compressor

The only question is what is the efficiency of the various compressors and drives.
I don't regard a 750 cfm electric compressor as a "little fan".
One major benefit of an electric driven system would be that the energy needed to drive the compressor is averaged out of the entire running time of the engine.
When the engine is on boost,the power to drive the compressor is coming from the battery.When it is off boost the battery is being charged.
The load on the motor from the compressor is averaged out over the whole run.

[imdying]

Electric fans won't do fuck all except maybe prevent the engine from starving of air, but then that's a design issue of the bike.

But there's no reason why you can use something like a Sprintex type supercharger with an electric motor to drive it. That'd be an excellent setup as it'd be switchable and you can vary the boost at any time. Main problem is you'd need to upgrade the electrics and alternator to provide enough juice to run the thing.
Oh dear, where to start. Prevent the engine from starving of air? Actually, being a restriction to the inlet, it's more likely to cause it to starve for air.

An electric motor to drive your supercharger... hmmmm just how big a motor do you think it would take to drive an air pump that can pump enough air to create boost on a motor that is already consuming large quantities of air? Yep that's right, a massive one. Now, what are we going to drive this massive electric motor with? The battery? hahahaahha... we're gonna drive this motor that is substantially larger than a starter motor with the battery? I feel another Tui ad coming on here... Upgrade the electrics? That's a bit of an understatement.

You've probably heard that at maximum output a supercharger is using as much power as it's generating? (massive massive generalization) Well if you're wanting another 60hp, that means a 60hp motor... that's not little :lol:

[imdying]

In theory you're talking bullshit.
Electrically driven compressor - Some of the total power gain is used by the extra load on the alternator needed to drive the compressor

Read his post again... he said electric fan, not electric compressor... I think you owe him an apology :)

[Pixie]

Read his post again... he said electric fan, not electric compressor... I think you owe him an apology :)
Semantics
I assumed he was using a common term,rather than the correct one.
The term "Blower" for a supercharger is technically wrong,too.
They are all compressors

[imdying]

Not semantics at all.. someone (N4CR) had talked about using computer fans, and as wicky as a Delta is, he was telling them they were out of their mind. As the link that was provided to the eSupercharger is nothing more than a fan, his comment was also relevant to that also.

It's also worth noting that an electrically driven compressor would technically work as a supercharger, it's just that the massive infrastructure (wiring, charging, battery, whatever) to support it (not to mention the massive electric motor itself) is 100% impracticle.

His usage of 'fan' and not 'compressor' is far more important than mere semantics. When he said 'fan' he was correct, if he'd said compressor, he'd have been wrong. That's not semantics, but a critical detail, and you've called his statement bullshit, which clearly it isn't. You still owe him an apology ;)

[Biohazard]

Wouldnt it just be easier if you buy a quicker bike .... just a thought

[Mental Trousers]

These guys (http://www.rasertech.com/technology.html) do high power compact electric motors. Can't find one that only makes 60hp though. However, the motors listed there are used in electric bikes (have a look at the some articles (http://www.gizmag.com.au/go/4083/)). They're too large but there are motors available that are small enough and grunty enough. Problem is wieght and feeding them.

[MikeyG]

Cheaper set-ups have the blower between the carbs and the engine. I think you need special carbs or fuel injection to have the carbs between the blower and the engine.

[SARGE]

how dp people go about supercharging a small engine? is it possible to say, mount the supercharger on top of the carbs?
if some idiot was thinking of doing this to a vt250 spada how would said idiot do it? please help me out here.... im thinking a subaru vivio sunit or maybe a small digger unit. i dont want a turbo cos i hate the thought of lag


why not just get a Gixxer 1000?.. 250's are throwaway bikes ..

[RiderInBlack]

These guys (http://www.rasertech.com/technology.html) do high power compact electric motors. Can't find one that only makes 60hp though. However, the motors listed there are used in electric bikes (have a look at the some articles (http://www.gizmag.com.au/go/4083/)). They're too large but there are motors available that are small enough and grunty enough. Problem is wieght and feeding them.So would it not be easier ta cut to the chase and have an electric bike:nya: or a hybrid one (like this (http://www.chooseyouritem.com/jokes/1stHybridMotorcycle.html):blip: ).

[willy_01]

There is no 'easy' way to get 60rwhp out of a 250cc, however if you buy a 250 rd/rz upgrade the bores, pistons, rods, pipes and carbs? (to a rd350, looks the same so you would get away with it 9/10 times getting a wof) and you have 69hp at the crank(I think), im sure skimming a wee bit off the heads, a re-jet and air filter should bump up the power to meet your requirements. Supercharging when done right may produce a dependable 60rwhp but the time and money to get it to this point would most likely cost more than what the bike cost you, Im guessing you would need to have a good efi set up aswell.

best of luck, if you did do it it would be very cool to see

[ducatilover]

Wouldnt it just be easier if you buy a quicker bike .... just a thought
the only other 250 id consider is an rs250....but if i wanted power band type performance i would turbo the spada...

the reason for not getting a faster bike is... what other twin will handle like my spada??? especially when i find a decent front end to stick on:rockon:

[Fooman]

Semantics
I assumed he was using a common term,rather than the correct one.
The term "Blower" for a supercharger is technically wrong,too.
They are all compressors

Well, it depends. A Roots-type blower, commonly used as a supercharger, is not a compressor. It's a postive displacement pump. It just moves X amount of air from inlet to outlet. The air compression happens after the blower, when you're trying to fit X amount of air into X/2 amount of cylinder.

Axial flow compressors (e.g. the compressor in most jet engines), centrifugal compressors (e.g. turbos), rotary vane compressors, screw compressors (Eaton, PSI) all compress the air (i.e. a change in specific volume of the working fluid) during flow through the compressor as well as shift the mass.


Cheers,
FM

[Ixion]

Tecnically I guess the distinction is between fan and pump. And even that is maybe vague. But the guts of it , that for supercharging to work , you have to have something that can force air or mixture into the cylinder at a positive pressure. Which a fan can't do - or not at enough pressure.

[Mental Trousers]

So would it not be easier ta cut to the chase and have an electric bike:nya: or a hybrid one (like this (http://www.chooseyouritem.com/jokes/1stHybridMotorcycle.html):blip: ).

With those motors, yes it would!!!! Me, I'd use a little gas motor to run an alternator to put out the juice for the electric motor. Dunno how big that'd have to be, but I'd say it'd be a better option than carrying half a ton of batteries.

[imdying]

the reason for not getting a faster bike is... what other twin will handle like my spada??? especially when i find a decent front end to stick on:rockon:Compared to the new R6, your bike will handle like a bucket of shite, no matter what front end you put on it. And even if it didn't, there's no road or track where the 80hp difference doesn't count.

[stanko]

With those motors, yes it would!!!! Me, I'd use a little gas motor to run an alternator to put out the juice for the electric motor. Dunno how big that'd have to be, but I'd say it'd be a better option than carrying half a ton of batteries.

See this is what is so silly about this thread. You would get an alternator, cabling and a motor to transfer a Kw or so less than 300mm. Why not use a shaft 14mm diameter 300mm long and save about 30kg?

[imdying]

See this is what is so silly about this thread. You would get an alternator, cabling and a motor to transfer a Kw or so less than 300mm. Why not use a shaft 14mm diameter 300mm long and save about 30kg?
*hugs* :first: :first:

[Motu]

Tecnically I guess the distinction is between fan and pump. And even that is maybe vague. But the guts of it , that for supercharging to work , you have to have something that can force air or mixture into the cylinder at a positive pressure. Which a fan can't do - or not at enough pressure.

Or more specificaly you need a restriction to create the pressure - like trying to stuff it into a closed end container.The Roots blower is mostly used on 2 stroke diesels,and that's just what it does - blow.It is there to scavange the exhaust gases,it doesn't add anymore air,but does fill the cyl completely which normal induction doesn't...so there is a power boost.The GMC blower was lifted from GMC diesels (later called Detroit Diesel) and put on top of a V8 for the classic supercharger application.Other Roots blowers were used on the Rootes TS3 and the Foden 2 strokes.

[Lou Girardin]

Semantics
I assumed he was using a common term,rather than the correct one.
The term "Blower" for a supercharger is technically wrong,too.
They are all compressors

Roots blowers aren't compressors. They are displacement pumps. They don't have any internal compression, unlike the vatious helical rotor types.
I had an Eaton unit on an MX5, it produced around 175 - 180 hp from 7.5psi boost. That doesn't sound much, but with boost and real torque from 1500 rpm it would leave a Cosworth Sierra up to 140 k's.

[imdying]

Ok, so we've all decided:
- Forced induction is a waste of time on a 250
- Electric superchargers are snake oil
- A fan can't compress air, or create any sort of boost
- Ducatilover needs to get a bigger bike (like a 916 :yes:)

[Ham]

cram a TL1000 engine in it... would be cheaper easier, faster, and probably lighter

[Kickaha]

.. 250's are throwaway bikes ..

So are Gixxer thou's if Dover is riding them

[Mr. Peanut]

the only other 250 id consider is an rs250....but if i wanted power band type performance i would turbo the spada...

the reason for not getting a faster bike is... what other twin will handle like my spada??? especially when i find a decent front end to stick on:rockon:

My Bike X 2? :innocent:

RS250's are overrated, If I spent $10000 doing up an NSR250 it would be faster (or equal) and more reliable.

[Pixie]

Wouldnt it just be easier if you buy a quicker bike .... just a thought
It's always easier to buy a quicker and better handling bike or lose 20 kg off one's fat arse.

[Pixie]

There is no 'easy' way to get 60rwhp out of a 250cc, however if you buy a 250 rd/rz upgrade the bores, pistons, rods, pipes and carbs? (to a rd350, looks the same so you would get away with it 9/10 times getting a wof) and you have 69hp at the crank(I think), im sure skimming a wee bit off the heads, a re-jet and air filter should bump up the power to meet your requirements. Supercharging when done right may produce a dependable 60rwhp but the time and money to get it to this point would most likely cost more than what the bike cost you, Im guessing you would need to have a good efi set up aswell.

best of luck, if you did do it it would be very cool to see
Why not get an RZ 350?
64 hp standard

[Pixie]

Roots blowers aren't compressors. They are displacement pumps. They don't have any internal compression, unlike the vatious helical rotor types.
I had an Eaton unit on an MX5, it produced around 175 - 180 hp from 7.5psi boost. That doesn't sound much, but with boost and real torque from 1500 rpm it would leave a Cosworth Sierra up to 140 k's.
Ok then.
All the piston compressors that I've worked with,in 20 years of servicing medical analysers,aren't compressors at all,they're pumps

[Pixie]

Roots blowers aren't compressors. They are displacement pumps. They don't have any internal compression, unlike the vatious helical rotor types.
I had an Eaton unit on an MX5, it produced around 175 - 180 hp from 7.5psi boost. That doesn't sound much, but with boost and real torque from 1500 rpm it would leave a Cosworth Sierra up to 140 k's.
Ok then.
All the piston compressors that I've worked with in 20 years of servicing medical analysers,aren't compressors at all,they're pumps.
s'funny,you'd think the compressed air industry would use the correct terms?

Any action that moves a gas,compresses it.Even a bike move through the air,or your colon.
I challenge anyone to refute this.

[Motu]

Ok then.
s'funny,you'd think the compressed air industry would use the correct terms?


I worked in the compressed air industry,admittedly 25 or more years ago - and we sometimes called them pumps,a bit loosely.Like,I might of been told to go and take the pump off and bring it back to the workshop.....we knew they were pumps....but really they were compressors,because that's the market we were in,compressing air....

[popelli]

if you want to go faster get a bigger motor

a good big motor will always beat a good small motor

[Jamezo]

Ladies, ladies, please. There's only been one kind of sensible suggestion made in this thread, and it is the kind that smokes. Both from the exhaust, and figuratively speaking, bikes with too many engine strokes.

[stanko]

Ok then.
All the piston compressors that I've worked with in 20 years of servicing medical analysers,aren't compressors at all,they're pumps.
s'funny,you'd think the compressed air industry would use the correct terms?

Any action that moves a gas,compresses it.Even a bike move through the air,or your colon.
I challenge anyone to refute this.

Convection moves a gas but has no compression, a ceiling fan moves a gas but no compression.

Moving a gas from a high pressure container to a low pressure one does not compress the gas, looks like you need another 20 years or so on the tools !

[Fooman]

Ok then.
All the piston compressors that I've worked with in 20 years of servicing medical analysers,aren't compressors at all,they're pumps.
s'funny,you'd think the compressed air industry would use the correct terms?

Any action that moves a gas,compresses it.Even a bike move through the air,or your colon.
I challenge anyone to refute this.

Well, here is something to really screw with your head - The quicker a fluid flows, the lower the pressure in that fluid (if the flow remains at the same height). This is one part of a fundamental relationship for all fluids that was discovered a couple of hundred years ago, by Bernoulli (one of them - there were lots...):

For any fluid, the sum of pressure, velocity and head is a constant, or

(velocity squared)/2 + (acceleration due to gravity)*height + pressure/density = constant

Simply this is an energy balance equation, harking back to Newton.

So, at the same head (height), the sum of velocity and pressure is a constant. Therefore if velocity increases, the pressure must decrease!

That relationship is pretty much the basis for a lot of fluid mechanics.

Now to tie everything togther, a two-stroke cylinder (which is a piston compressor!) without a head is a pump. With a head, it's a compressor.

Easiest way to supercharge a VT250 would be to turn it into a SC125, bore out the rear cylinder, so it displaces more than the front, and use that to pump more than 125cc worth of air into the front cyclinder! :blip:

FM

[Gazman]

Guy down this way had a supercharged V-Max, biggest problem was keeping the front wheel on the ground.

hehe :first:

[Ixion]

,,,Easiest way to supercharge a VT250 would be to turn it into a SC125, bore out the rear cylinder, so it displaces more than the front, and use that to pump more than 125cc worth of air into the front cyclinder! :blip:

FM

Come back DKW , all is forgiven.

[Edbear]

It's always easier to buy a quicker and better handling bike or lose 20 kg off one's fat arse.




Believe me, it ain't easy losing 20kg!:laugh:

[imdying]

Come back DKW , all is forgiven.
Ahahahaha, you old fart! :blip:

[Lou Girardin]

The Roots blowers, which were originally called cabin blowers, just move air. The compression occurs at the closed valves. Helical type blowers compress air within the unit.
When my Mazda suffered the dreaded crank keyway problem, the altered valve timing caused manifold pressure to rise to 9 psi.

[imdying]

Was that one of those pressure wave supercharger 2L diesels? They worked a treat they did :) Digusting how little gas they'd use on state highway 1 at 160km/hr in the dead of night :innocent:

[onearmedbandit]

Expect when they let go. Which they usually did...

[Lou Girardin]

Our workshop has just fitted the first Sprintex to the boss's VRod.
Hasn't been finally dyno'd yet, but they're getting 140 hp at the wheel from 4 psi boost in the Aussie tests.
He says it'll light up the rear with just a handful of throttle.
With it's reluctance to wheelie, this could be a traffic light demon.

[imdying]

Do they make a version small enough to couple to a 250?

[Kickaha]

I just remembered Speedpro was doing a supercharged 125 twin,which he'd cut two cylinders off a 250/4

http://www.kiwibiker.co.nz/forums/showpost.php?p=235519&postcount=3

[imdying]

Wonder how much meat is in the VTR250 barrels? Wonder how far out in the classic rebore you could go?

[ducatilover]

Compared to the new R6, your bike will handle like a bucket of shite, no matter what front end you put on it. And even if it didn't, there's no road or track where the 80hp difference doesn't count.
actually its more than 80hp difference....

[imdying]

Awww man, I tried to wind you up with that days ago :lol:

Check out that thread two posts above... that guy went back to a turbo because he ran out of cash... maybe he'll sell you the little supercharger? Or at least let you know where he got it? Hell, sounds like he could fab it for ya... might need some money :)

[ducatilover]

i was dribling on a 748s monopost today and maybe i should get a real bike instead of my gutless toy? hmmmm:zzzz:

[stanko]

Say you did go the dkw way and use 1 cylinder to supercharge the other , it wouldnt need to be bigger because on a 4T it only inhales once ever 2 revs , but the charging cylinder (piston compressor) will exhaust every revolution. Maths isnt my strong point , would we get 7psi or 14psi from this arrangment (not taking volumetric efficiency into account)
If it didnt work properly you could use it to pump tyres, inflatable beds etc

[imdying]

i was dribling on a 748s monopost today and maybe i should get a real bike instead of my gutless toy? hmmmm:zzzz:
That would be the smart choice... but hey, noone says you can't keep the spada too!!!

[ducatilover]

im sure my spada becomes increasingly parthetic each time i ride it! its freaking slow....i look foward to hitting 165kph after a billion ks on the straights....well its not that slow, but you get the idea

[ducatilover]

That would be the smart choice... but hey, noone says you can't keep the spada too!!!
good point. :scooter: <<<spada

[classic zed]

my spare Kawasaki Z1300 is going back together with a supercharger, I have bought one from a Toyota MR2 (good for up to 1800cc) primarily because it can be switched off, it has a magnetic clutch so I can switch it on whenever I feel the need, I am also fitting fuel injection and a 1500cc (wiseco) overbore kit.

With the standard power of the 1300 6 cylinder engine being 120Bhp I am not sure what to expect when she is bored to 1500 and fed with up to 7psi boost :gob:

One thing I am sure of, its gonna be fun to ride, I have ZX12 upside down forks, ZX12 Wheels and 6 pot calipers all round. I have to get the rear wheel modified to take the driveshaft system and make a new swing arm to accomodate the wider rear tyre. ZX10 switchgear and master cylinders complete the bits so far.

So loads of frame mods, engine mods, cosmetic mods and it should be ready

:ride:

[ducatilover]

shit! i want to see and ride that:gob:

[classic zed]

I just have the fuel tank to spray on my Z1300 and the restoration is complete, then the boss (wife) says I can get on with the the other one, so it might be a few months before its done, just in time for summer hopefully.
Not sure I'd want to ride it on wet roads though

Originally it was going to be twin turbo charged i.e. 3 cylinders feeding each turbo, but I decided the supercharger would be better, if a bit more work.:yes:

[ducatilover]

thatd be a bitch in the wet. but itd be a motherf**king quick bike! makes me think of that z1300 that was a v12....awesome

[Badcat]

i was dribling on a 748s monopost today and maybe i should get a real bike instead of my gutless toy? hmmmm:zzzz:

get the bros back on the road.

[Ixion]

Good idea, but , uh, get the correct grade of licence first , eh.

[ducatilover]

get the bros back on the road.
thats proving to be rather difficult, but nonetheless im going to. but i cant afford it at the moment. and i cant find a suitable front end for sale. i need a cbr400rr front end, or a machining centre so i can re-machine the triple clamps and bung some USD forks in there

[ducatilover]

Good idea, but , uh, get the correct grade of licence first , eh.
yeah, i think that would be apropriate